Single-step process for the preparation of bis-(acetoacetylamino

Details Single-step process for the preparation of bis-(acetoacetylamino Single-step process for the preparation of bis-(acetoacetylamino

1993-09-01

1996-09-24

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534887, 534656, 534740, 534748, 106 22K, C09B 4100, C09B 33153, C09B 5612, C09D 1102, B41M 100

Patent

active

055592163

ABSTRACT:
An ecologically and economically advantageous process for preparing a disazo pigment of the formula (I) or a mixture of said disazo pigments ##STR1## where D.sup.1 and D.sup.2 are identical or different and each is unsubstituted phenyl, phenyl with from 1 to 5 substituents, unsubstituted naphthyl, naphthyl with from 1 to 3 substituents, unsubstituted anthraquinonyl, anthraquinonyl with from 1 to 3 substituents, or a radical of a fused aromatic heterocycle which contains from 1 to 3 identical or different heteroatoms from nitrogen or oxygen and sulfur and is unsubstituted or has from 1 to 3 substituents,
R.sup.1 and R.sup.2 are identical or different and each is hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.5 -alkoxycarbonyl, nitro, cyano, phenoxy or trifluoromethyl, by azo coupling, comprises

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